.card-container {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 40px;
    margin-top: 40px;
    flex-wrap: wrap; /* passe dessous sur mobile */
}

.card {
    flex: 1;
    max-width: 450px;
    min-width: 300px;
    padding: 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15);
    text-align: center;
}